Gas Heat ESCO Practice Exam

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A technician observes the burner flames wavering in one corner shortly after starting up a 5-year-old natural gas furnace. What is the most likely cause?

  1. A faulty heat exchanger

  2. Improper gas pressure

  3. Dirty burners

  4. Clogged air filter

The correct answer is: A faulty heat exchanger

This is likely caused by a faulty heat exchanger that poses a potential safety hazard. A faulty heat exchanger can cause the flames to waver, as well as produce carbon monoxide. Improper gas pressure, dirty burners, and a clogged air filter can also cause issues with the flame, but they are not considered as likely as a faulty heat exchanger in a 5-year-old furnace. It is important to address this issue promptly to ensure the safety and efficiency of the furnace.

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